--- test_etcp_simple_traffic.c.backup
+++ test_etcp_simple_traffic.c
@@ -241,14 +241,20 @@
     DEBUG_DEBUG(DEBUG_CATEGORY_ETCP, "Parsing crypto keys: priv_len=%zu, pub_len=%zu", 
                 strlen(priv_key_hex), strlen(pub_key_hex));
     
+    // Ensure strings are properly null-terminated and have correct length
+    size_t priv_len = strlen(priv_key_hex);
+    size_t pub_len = strlen(pub_key_hex);
+    if (priv_len != 64 || pub_len != 128) {
+        DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "Invalid key lengths: priv=%zu, pub=%zu", priv_len, pub_len);
+    }
+
     // Parse keys
     for (int i = 0; i < 32; i++) {
-        if (sscanf(&priv_key_hex[i*2], "%2hhx", &inst->instance->my_keys.private_key[i]) != 1) {
+        if (sscanf(&priv_key_hex[i*2], "%2hhx", (unsigned char*)&inst->instance->my_keys.private_key[i]) != 1) {
             DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "Failed to parse private key byte %d", i);
         }
     }
     for (int i = 0; i < 64; i++) {
-        if (sscanf(&pub_key_hex[i*2], "%2hhx", &inst->instance->my_keys.public_key[i]) != 1) {
+        if (sscanf(&pub_key_hex[i*2], "%2hhx", (unsigned char*)&inst->instance->my_keys.public_key[i]) != 1) {
             DEBUG_ERROR(DEBUG_CATEGORY_ETCP, "Failed to parse public key byte %d", i);
         }
     }